LM2575TV-3.3G Equivalent & Substitute Parts

Part Overview

The LM2575TV-3.3G is a buck switching regulator IC from onsemi, delivering a fixed 3.3V output at 1A with input voltage range of 4.75V to 40V. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and is housed in a TO-220-5 package with formed leads.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM2575TV-3.3G
Manufacturer	onsemi
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Type	Fixed 3.3V
Output Current	1A
Input Voltage Range	4.75V to 40V
Switching Frequency	52kHz
Package / Case	TO-220-5 Formed Leads
Operating Temperature	-40°C to 125°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LM2575TV-3.3G is determined by the following critical parameters:

Output Configuration: Positive fixed 3.3V output
Output Current: 1A minimum
Input Voltage Range: Minimum 4.75V, maximum 40V or higher
Topology: Buck switching regulator
Package: TO-220-5 Formed Leads (through-hole mounting)
Switching Frequency: 52kHz
Operating Temperature Range: -40°C to 125°C
Synchronous Rectifier: No

Substitute parts must match all critical parameters to ensure direct functional replacement without circuit redesign. The following parts meet these criteria:

MFR Recommended Substitute: LM2575T-ADJG (onsemi) — Adjustable output variant from the same manufacturer base product line, requires external resistor network for 3.3V configuration.

Similar Substitutes: LM2575HVT-3.3/LF03 (Texas Instruments) and TL2575HV-33IKV (Texas Instruments) — Fixed 3.3V output variants with extended input voltage ratings and active product status.

Parameter Comparison

Parameter	LM2575TV-3.3G (Main)	LM2575T-ADJG (MFR Recommended)	LM2575HVT-3.3/LF03 (Similar)	TL2575HV-33IKV (Similar)
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments
Output Type	Fixed 3.3V	Adjustable 1.23V to 37V	Fixed 3.3V	Fixed 3.3V
Output Current	1A	1A	1A	1A
Input Voltage (Min)	4.75V	4.75V	4V	4.75V
Input Voltage (Max)	40V	40V	60V	60V
Switching Frequency	52kHz	52kHz	52kHz	52kHz
Package / Case	TO-220-5 Formed Leads	TO-220-5	TO-220-5 Formed Leads	TO-220-5 Formed Leads
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Fixed 3.3V Output)

LM2575HVT-3.3/LF03 and TL2575HV-33IKV are the preferred substitutes for the obsolete LM2575TV-3.3G. Both parts deliver fixed 3.3V output at 1A with identical switching frequency and operating temperature range. Both are active products with ROHS3 compliance. The Texas Instruments variants offer extended maximum input voltage (60V versus 40V), providing greater design margin in applications with variable input sources.

For Adjustable Output Configuration

LM2575T-ADJG from onsemi provides an alternative within the same manufacturer ecosystem. This adjustable variant requires external resistor network configuration to establish 3.3V output but maintains identical electrical performance characteristics. This option is suitable for designs requiring output voltage flexibility or when onsemi component continuity is a procurement requirement.

Compliance and Certification

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing. Selection should prioritize active product status to ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can LM2575T-ADJG directly replace LM2575TV-3.3G without circuit modification?

A: LM2575T-ADJG requires external resistor network configuration to set output voltage to 3.3V. Direct pin-for-pin replacement is not possible without adding feedback resistors. LM2575HVT-3.3/LF03 and TL2575HV-33IKV provide true direct replacement capability.

Q: What is the difference between the fixed and adjustable output variants?

A: Fixed output variants (LM2575TV-3.3G, LM2575HVT-3.3/LF03, TL2575HV-33IKV) deliver 3.3V without external configuration. Adjustable variants (LM2575T-ADJG) require external resistor divider network to set output voltage, offering design flexibility at the cost of additional components.

Q: Are the Texas Instruments substitutes compatible with existing PCB layouts?

A: Yes. LM2575HVT-3.3/LF03 and TL2575HV-33IKV use identical TO-220-5 package with formed leads, matching the original part's pinout and mechanical footprint. No PCB redesign is required.

Q: Why do some substitutes have higher maximum input voltage ratings?

A: LM2575HVT-3.3/LF03 and TL2575HV-33IKV support 60V maximum input versus 40V for the original part. This represents an enhanced design specification from the manufacturers and provides additional design margin without affecting compatibility.

Q: Which substitute should be selected for new production designs?

A: LM2575HVT-3.3/LF03 or TL2575HV-33IKV are recommended for new designs. Both are active products with extended input voltage ratings and established long-term availability. Selection between the two depends on existing supply chain relationships and inventory availability.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching regulatory requirements of the original part.

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